Google A2UI v0.9 Brings Prompt-First Generative UI Standard

InfoQ coverage of A2UI v0.9: philosophical shift from v0.8 structured-output-first to prompt-first where schemas embed in LLM system prompts. Key messages: createSurface replaces beginRendering, modular JSON schemas split into common_types, server_to_client envelope, and basic_catalog. AG-UI middleware enables day-zero integration for existing agent pipelines.